The ileum contains villi that project into the lumen and increase the amount of surface area.
Villi are small finger-like structures that project into the lumen of the small intestine. Villi increase the surface area of the intestinal walls for easy and quick absorption of digested food with the addition of digestive secretions. Villi vary in length from about 0.5 to 1 mm. They are usually found in large numbers at the beginning of the small intestine and they reduce toward the end of the tract.
Through the process of transformation. Hope this helps.
Ur ans will be
whales use lungs to breathe they develop it during metamorphosis
fishes have gills
The step that will not occur would be oxidative phosphorylation, this requires oxygen to be the final electron acceptor.
